(set-logic QF_S)
(set-option :strings-exp true)
(set-info :status sat)

(declare-fun var_0 () String)
(declare-fun var_1 () String)
(declare-fun var_2 () String)
(declare-fun var_3 () String)
(declare-fun var_4 () String)
(declare-fun var_5 () String)
(declare-fun var_6 () String)
(declare-fun var_7 () String)
(declare-fun var_8 () String)
(declare-fun var_9 () String)
(declare-fun var_10 () String)
(declare-fun var_11 () String)
(declare-fun var_12 () String)

(assert (str.in_re "" (re.* (re.range "a" "u"))))
(assert (str.in_re var_4 (re.* (re.range "a" "u"))))
(assert (str.in_re var_4 (re.* (re.union (str.to_re "a") (str.to_re "b")))))
(assert (not (str.in_re (str.++ var_4 "z" ) (re.* (str.to_re "z")))))
(check-sat)
